Adhesives for (Nano-) Imprint and Wafers

Optical resins and adhesives for imprint and optical bonding applications can be used for light carpets in the automotive industry, for sensors in smart devices and wearables, or for creating structured light in projectors or time-of-flight sensing applications.

Specially formulated adhesives are available for imprint replication of refractive lenses and diffractive optical elements (DOEs). These adhesives are suitable for micro- and nano-imprint lithography (NIL), wafer level optics, and wafer bonding. These adhesives can be easily applied via puddle dispensing, spin-coating or jetting. They offer excellent adhesion to commonly used grades of glass wafers  and upcoming new polymer substrates including optical grade PET or PC. Once applied and imprinted, they are quickly cured with UV light, creating a precise and durable structure on the wafer. 

Highly complex optical geometries can be produced through the targeted, two-dimensional bonding of several such structured wafers with each other – and, if necessary, with so-called spacer wafers as precise spacers; this bonding technique is known as wafer bonding. Panacol has developed customized adhesives for this purpose, which are characterized by high optical quality, reliable curing in thin layers, as well as excellent mechanical properties in combination with different materials such as glass, epoxy, and metal-based masking layers.

Panacol also offers black UV-curing adhesives for black coatings and optical edge sealing. These black epoxy adhesives are permeable to UV light when uncured. After curing, they are opaque and impermeable to light.

epoxy adhesive for nano imprint on wafers

Nanostructures are printed in a very thin layer of adhesive on a glass wafer

In the following table you will find a selection of our adhesives that are suitable for various applications in the field of optoelectronics. Further products or customized solutions are available on request.

To download the technical datasheets (TDS) please click on the adhesive name.

Adhesive Viscosity [mPas] Base Curing* Properties
Vitralit® 1860 35.000-50.000 (Rheometer, 25 °C, 10s^-1) Acrylate UV/VIS Low coefficient of thermal expansion
Low shrinkage
Impact resistant
Dry surface
Vitralit® 7311 30-100 acrylate UV
High resistance to alcohols and moisture
very high adhesion to plastics, glass and metals
suitable for bonding large areas
certified according to USP Class VI
Vitralit® BL UC 1103 3,500-7,000 (Rheometer, 25 °C, 10s^-1) epoxy UV/VIS black colour
low shrinkage
low CTE
high glass transition temperature
good chemical resistance
resistant to sterilization
Vitralit® UC 1632 80-100 (LVT, 25°C, Sp. 2/30 rpm) Epoxy UV Self-levelling
High transmission
Transparent, resistant to yellowing
High adhesion to glass
Vitralit® UC 1633 170-230 (Rheometer, 25°C) Epoxy UV High transmission
Resistant to yellowing
Good adhesion to glass
No additional primer needed
Good demolding from mold (PDMS)
Halogen free
Vitralit® UC 1658 75 - 200 (Brookfield LVT, 25°C, Sp. 2/30 rpm) Epoxy UV Low viscosity
Low Sb-content
Vitralit® VBB-60 3.500-5.000 (Rheometer, 25 °C, 10s^-1) acrylate UV
Excellent peel strength
Optically clear
Exceptionally flexible
Excellent elongation
Resistant to moisture and temperature change
Structalit® 5511 800-1,200 epoxy thermal at 60°C Non-conductive
Outstanding adhesion to high performance
plastics (LCP, PBT)
High purity
Electronic grade standard
Structalit® 5531 5,000-10,000 (Rheometer, 25°C, 10s^-1) epoxy thermal at 60°C Non-conductive
Outstanding adhesion to high performance plastics (LCP, PBT)
High purity
Electronic grade standard
Good mechanical stability
Good chemical resistance

*UV = 320 - 390 nm          VIS = 405 nm